Yeah it is a 8600M GT, so I'll try to adjust the fan and see if it gets better. If not, well, I looked at replacement costs and it would be less than $200 - although I might simply buy another laptop and use this one for parts (the original price was only about $600-700 and so $200 is about a third of the cost of a new one). Any other ideas of how to maximize the life expectancy?
EDIT: It seems, so far, to only happen when rainbow Six Vegas 2 is running (it was minimized for the screenshot as I was trying to see if only the game was affected) - could it be an issue with that program that is causing the artifacts or does it still look like a dying card?